Substitution controlled aryne insertion: synthesis of diarylmethane/chromones.

Aryne insertion reaction with 2-aroyl malonates/cyanoesters lead to the formation of diarylmethane or chromones depending on the substitution on the aryne ring. The presence of an electronegative atom at the position of arynes generates chromones, whereas other arynes lead to the formation of diarylmethanes, a cascade double aryne insertion.